I would like to assign every U.S. census tract its own unique classification on the urban-rural spectrum. USDA's Rural-Urban Area Commuting Codes (RUCA) is a good start, but it's focus is rural - it is not very useful when it comes to distinguishing areas that are CBD, urban core, inner suburban, or exurban within a metropolitan area.
I like the idea of the City Sector model, as summarized in the table below - sourced from a recent Wendell Cox article in NewGeography.com. However, this model is urban-focused, and overlooks areas that could be designated as micropolitan, small town, or rural.
It would be ideal to have a model that could thoroughly capture the full urban-rural spectrum without having to combine the RUCA model with the City Sector model. Does such a model exist? And if so, is it available at a defined geographic level (preferably census tract)?
Separately, is there a publicly available source for the City Sector model classifications at the census tract level, or is this something researchers typically build from scratch?